MCU_SWM221/XTAL/StopDetect/APP/main.c

#include "SWM221.h"

void SerialInit(void);

int main(void)
{	
	int i;
	
	SystemInit();
	
	SerialInit();
	
	for(i = 0; i < SystemCoreClock/4; i++) __NOP();	//<2F>ȴ<EFBFBD><C8B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD><C8B6><EFBFBD><EFBFBD><EFBFBD>ֹ<EFBFBD>ϵ<EFBFBD>ʱ<EFBFBD><CAB1>ʶ<EFBFBD><CAB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><CDA3>
	
	SYS->XTALSR = SYS_XTALSR_STOP_Msk;				//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־
	NVIC_ClearPendingIRQ(XTALSTOP_IRQn);
	NVIC_EnableIRQ(XTALSTOP_IRQn);
   	
	while(1==1)
	{
		printf("SystemCoreClock = %d\r\n", SystemCoreClock);
		
		for(i = 0; i < SystemCoreClock/4; i++) __NOP();
	}
}


void XTALSTOP_Handler(void)
{
	/* <20><><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4> switchTo8MHz()<29><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD><EFBFBD><EFBFBD>ʱϵͳʱ<CDB3>ӻ<EFBFBD><D3BB>Զ<EFBFBD><D4B6>л<EFBFBD><D0BB><EFBFBD><EFBFBD>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	   <EFBFBD><EFBFBD><EFBFBD>ⲿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>񵴺Ͳ<EFBFBD><EFBFBD>񵴼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳʱ<EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD>ʱ<EFBFBD>Ӻ<EFBFBD><EFBFBD>ⲿʱ<EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD> */
	switchTo8MHz();
	
	SystemCoreClockUpdate();
	
	SYS->XTALCR = 0;							//<2F>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ر<EFBFBD>
	NVIC_DisableIRQ(XTALSTOP_IRQn);
	
	UART_SetBaudrate(UART0, 57600);				//ϵͳ<CFB5><CDB3>Ƶ<EFBFBD>仯<EFBFBD><E4BBAF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>趨<EFBFBD><E8B6A8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	printf("XTAL Stop Detected!\r\n");
}


void SerialInit(void)
{
	UART_InitStructure UART_initStruct;
	
	PORT_Init(PORTA, PIN0, PORTA_PIN0_UART0_RX, 1);	//GPIOA.0<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ΪUART0 RXD
	PORT_Init(PORTA, PIN1, PORTA_PIN1_UART0_TX, 0);	//GPIOA.1<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ΪUART0 TXD
 	
 	UART_initStruct.Baudrate = 57600;
	UART_initStruct.DataBits = UART_DATA_8BIT;
	UART_initStruct.Parity = UART_PARITY_NONE;
	UART_initStruct.StopBits = UART_STOP_1BIT;
	UART_initStruct.RXThreshold = 3;
	UART_initStruct.RXThresholdIEn = 0;
	UART_initStruct.TXThreshold = 3;
	UART_initStruct.TXThresholdIEn = 0;
	UART_initStruct.TimeoutTime = 10;
	UART_initStruct.TimeoutIEn = 0;
 	UART_Init(UART0, &UART_initStruct);
	UART_Open(UART0);
}

/****************************************************************************************************************************************** 
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: fputc()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>: printf()ʹ<EFBFBD>ô˺<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>ʵĴ<EFBFBD><EFBFBD>ڴ<EFBFBD>ӡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: int ch		Ҫ<EFBFBD><EFBFBD>ӡ<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD>
*			FILE *f		<EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>    <EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
* ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <EFBFBD><EFBFBD>
******************************************************************************************************************************************/
int fputc(int ch, FILE *f)
{
	UART_WriteByte(UART0, ch);
	
	while(UART_IsTXBusy(UART0));
 	
	return ch;
}